Defensive publication



o m DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice of Apr.11, 1968, 849 CG. 1221. Identification is by serial number of theapplication and the heading indicates the number of pages ofspecification, including claims, and of sheets of drawing contained inthe application as originally filed. The file of this application isavailable to the public for inspection; reproduction may be purchasedfor 30 cents per sheet.

Applications published under the Defensive Publication Program have notbeen examined as to the merits of alleged invention. The Patent Ofiicemakes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED SEPTEMBER 2, 1969 795,353 CHEMICAL SENSITIZATION 0FUNSENSITIZED PHOTOGRAPHIC SILVER HALIDE Judith A. Schwan, Kodak ParkDivision, Rochester, N.Y. 14650 Filed Jan. 30, 1969. Published Sept. 2,1969 Int. Cl. G03c 1/08, 1/74, 1/34 US. Cl. 96-108 N0 Drawing. 18 PagesSpecification An unsensitized photographic silver halide emulsion layeris chemically sensitized at a desired time prior to exposure bysubjecting the emulsion layer to elevated temperatures in the presenceof a chemical sensitizer. A sulfur and gold-sensitized emulsion layer isprovided by contacting the layer with a gold sensitizer subsequent tosulfur sensitization.

